While they don't advise using essential oils on small animals, Aromatics International does sell guaranteed pure oils. They're recommended if you're going to be using your oils for anything therapeutic. http://www.aromaticsinternational.com

What is this pet thing? Possibly the term should be symbiotic? People(animals-mammals) have bonded with many other creatures over the years. On the other note, they have enslaved many others. So, pet????